Spectral Surface Albedo Over Morocco And Its Impact On Radiative Forcing Of Saharan Dust (Eike Bierwirth, Manfred Wendisch, André Ehrlich, Birgit Heese, Matthias Tesche, Dietrich Althausen, Alexander Schladitz, Detlef Müller, Sebastian Otto, Thomas Trautmann, Tilman Dinter, Wolfgang Von Hoyningen-Huene, Ralph Kahn)